The question speaks mostly for itself. I'm currently doing high school and while I'm very interested in mathematics, I do not have the appropriate level to answer many questions. Complex Vector Fields, Einstein Summation and Analytical Formulas fly way over my head (although they do sound interesting). Where could I find some simpler questions which I could answer and help other people with.
(a very long) P.S. After some thinking I've realized that this question really comes down to the real purpose of MathSE. At the one hand you want to document all questions and their answers, but you also want to help the person asking the question. These two mostly overlap of course, but if you, lets say, just copied a page from your math homework stating this:
$$\int_{-2}^{2} x^3 dx$$
And saying something like "My book says this is equal to zero, but I do not understand". Then these motives do not overlap. While we could help the person in question it wouldn't be any good to archive this question. I personally would still like to help since integration is one of the things I (think I) genuinely understand. However others might see this as a waste of time and space. So that's interesting I guess. I don't really have a solution or conclusion to this conundrum, but I felt like leaving my own perspective and procrastinating from the homework I should be doing right now.
But just to get back on topic: What tags have questions I could answer? What are some good searchterms I could use? I'd love to get some advice!